ceph tell osd.* injectargs '--osd_recovery_delay_start 0'
ceph tell osd.* injectargs '--osd_recovery_max_active 20'

ceph tell osd.* injectargs '--osd_recovery_max_single_start 1'
ceph tell osd.* injectargs '--osd_recovery_max_chunk 8000000'

ceph tell osd.* injectargs '--osd_backfill_scan_min 1'
ceph tell osd.* injectargs '--osd_backfill_scan_max 20'

ceph tell osd.* injectargs '--osd_max_backfills  10' 
